a-a a-b a-c a-t aaa aab aac aag aak aas aat ab- aba abb abc abg abk abs abt ac- aca acb acc acg ack acs act ag- aga agb agc agg agk ags agt aka akb akc akg akk aks as- asa asb asc asg ask ass ast at- ata atb atc atg ats att baa bab bac bag bak bas bat bba bbb bbc bbg bbk bbs bbt bca bcb bcc bcg bck bcs bct bga bgb bgc bgg bgk bgs bgt bka bkb bkc bkg bkk bks bkt bsa bsb bsc bsg bsk bss bst bta btb btc btg btk bts btt c-- caa cab cac cag cak cas cat cba cbb cbc cbg cbk cbs cbt cca ccb ccc ccg cck ccs cct cga cgb cgc cgg cgs cgt cka ckb ckc cks ckt csa csb csc csg csk css cst cta ctb ctc ctg ctk cts ctt gaa gab gac gag gak gas gat gba gbc gbg gbk gbs gbt gca gcb gcc gcg gck gcs gct gga ggb ggc ggg ggs ggt gka gkb gks gkt gsa gsb gsc gsg gsk gss gst gta gtb gtc gtg gtk gts gtt k-t ka- kaa kab kac kag kak kas kat kba kbb kbc kbk kbs kca kcb kcc kcg kck kcs kct kga kgb kgc kgs kkb kkc kkk kks kkt ksa ksb ksc ksg ksk kss kst kta ktb ktc ktg ktk kts ktt saa sab sac sag sak sas sat sba sbb sbc sbg sbk sbs sbt sca scb scc scg sck scs sct sga sgb sgc sgg sgk sgs sgt sk- ska skb skc skg skk sks skt ss- ssa ssb ssc ssg ssk sss sst sta stb stc stg stk sts stt taa tab tac tag tak tas tat tba tbb tbc tbg tbk tbs tbt tca tcb tcc tcg tck tcs tct tga tgb tgc tgg tgk tgs tgt tka tkb tkc tkg tkk tks tkt tsa tsb tsc tsg tsk tss tst tta ttb ttc ttg ttk tts ttt